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Nothing is just for the abs, every exercise you do tones and straitens other muscles. That is just companies wanting you to buy their product...have one for the right leg, one for the left leg, one for the arms, one for the neck, then the back, the front, the foot...If you exercise you move all your muscles.
Do not buy into the hype...go to the store of your chose and get one of those big balls for $.99 the kids play with...it is just as big and strong.
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